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3
votes
4answers
314 views

How to securely share key between two remote devices?

Assuming I have a server/client topology, currently I'm facing the problem that I want to generate some key on the client side and somehow make the remote server get it securely. I'm using AES on ...
1
vote
1answer
57 views

What to do with the shared secret?

I've been using Diffie-Hellman (although, now looking into SRP) for sending data encrypted between two hosts. After the initial handshake, both the end hosts have generated the same shared secret. So, ...
3
votes
3answers
124 views

Governement like classified information system

I need to implement a classification system for my company, similar to the government's. I'm working for a company working with the government. The classification system in my country isn't public so ...
2
votes
1answer
72 views

Layered email encryption with multiple private keys on separate media

I'd like to encrypt e-mail messages so that multiple physically separated keys are needed to decrypt them. For example, I'd like to have three private keys stored on different media, as in: key A ...
0
votes
1answer
83 views

How does shared folders work with Lastpass

I was wondering how the concept of Shared folders work with Lastpass. As I understand from their site, Lastpass has a Master password, which acts as the encryption key (say MK) for all data stored in ...
6
votes
2answers
752 views

Encrypting something with multiple keys such that k out of n keys are needed; what's it called?

I am trying to find information on how to encrypt something in such a way that there are n keys, and k of them are needed for decryption. However, I have been searching Google for half an hour but ...
3
votes
2answers
189 views

Is splitting up an AES Key a problem?

I'm wondering if it would be a problem to split up a 256 bit AES-Key into two 16-Byte blocks and distribute it, to implement some kind of a four-eyes-principle (you need two persons to decrypt a ...
6
votes
3answers
163 views

What would be the application-level equivalent of dynamic communication secrets?

I'm probably just thick and sufficiently new to security related issues in software development, but since I can't find information and I've been stuck on Googling this for a while. Recently I came ...
3
votes
1answer
368 views

Standards for secure key backup of master keys with secret sharing

In many cases, there is a single master key that is installed in a HSM or similar device, but which should be backed up. The recommended method for this backup in many cases is to encrypt the master ...